package com.example.demo.designPhilosophy.arp;
/**
* @description: TODO 第二种方式  组成/聚合复用原则
* @author yangzhenyu
* @date 2022/2/18 17:33
* @version 1.0
*/
public class B1 {
    private R a;
    public void setA(R a){
        this.a = a;
    }
    public R getA(){
        return a;
    }
}
